Elvaloy® RET Fights Temperature and Fatigue Cracking
DuPont™ Elvaloy® RET Fights Temperature and Fatigue Cracking
Asphalt can be made more resistant to thermal and fatigue cracking by increasing binder flexibility and internal resilience at a molecular level. DuPont™ Elvaloy® RET is a reactive terpolymer that "locks in" the extra performance needed for longer wear and wider temperature tolerance.
Bending Beam Tests Compare Cold-Temperature Performance
Elvaloy® RET broadly outperformed grafted SBS in tests conducted in granite and limestone aggregates, by the U.S. Federal Highway Administration.
Wheel Path Cracking Study in Northern Ontario
On Canada Highway 655 north of Timmins, Ontario, a pavement trial was constructed in 2003. Seven test sections (one with Elvaloy® RET) were inspected annually for top-down fatigue cracking after cold winters.
Cycles to Failure: Comparing Eight Polymer Modifiers
Eleven binders were used in this study of fatigue failure. The mixes made with Elvaloy® RET far outdistanced the other samples in terms of cycles to failure.
Fatigue cracking can be reduced or eliminated using a more resilient RET-modified asphalt binder
By changing asphalt binder resilience at a molecular level, DuPont™ Elvaloy® RET "locks in" stronger performance throughout the binder. Unlike a "mixed-in" modifier, the RET reactive terpolymer creates a more intrinsic, non-separating change in binder properties.
The improved properties are uniformly dispersed, because of RET's deeper, fluid-fluid contact and chemical bonding. Resulting binders offer more resilience to internal stresses, and are less susceptible to fatigue cracking.